Description

This function is
EXPERIMENTAL. The behaviour of this function, its name, and
surrounding documentation may change without notice in a future release of PHP.
This function should be used at your own risk.

This method allows you to register a PHP function with SQLite as an
UDF (User Defined Function), so that it can be called
from within your SQL statements.

The UDF can be used in any SQL statement that can call functions, such as
SELECT and UPDATE statements and also in triggers.

In this example, we have a function that calculates the md5 sum of a
string, and then reverses it. When the SQL statement executes, it
returns the value of the filename transformed by our function. The data
returned in $rows contains the processed result.

The beauty of this technique is that you do not need to process the
result using a foreach loop after you have queried for the data.